// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/media/media_capture_devices_impl.h"

#include "content/browser/browser_main_loop.h"
#include "content/browser/renderer_host/media/media_stream_manager.h"
#include "content/public/browser/browser_thread.h"

namespace content {

namespace {

    void EnsureMonitorCaptureDevices()
    {
        DCHECK_CURRENTLY_ON(BrowserThread::UI);
        BrowserThread::PostTask(
            BrowserThread::IO, FROM_HERE,
            base::Bind(&MediaStreamManager::EnsureDeviceMonitorStarted,
                base::Unretained(
                    BrowserMainLoop::GetInstance()->media_stream_manager())));
    }

} // namespace

MediaCaptureDevices* MediaCaptureDevices::GetInstance()
{
    return MediaCaptureDevicesImpl::GetInstance();
}

MediaCaptureDevicesImpl* MediaCaptureDevicesImpl::GetInstance()
{
    return base::Singleton<MediaCaptureDevicesImpl>::get();
}

const MediaStreamDevices&
MediaCaptureDevicesImpl::GetAudioCaptureDevices()
{
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    if (!devices_enumerated_) {
        EnsureMonitorCaptureDevices();
        devices_enumerated_ = true;
    }
    return audio_devices_;
}

const MediaStreamDevices&
MediaCaptureDevicesImpl::GetVideoCaptureDevices()
{
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    if (!devices_enumerated_) {
        EnsureMonitorCaptureDevices();
        devices_enumerated_ = true;
    }
    return video_devices_;
}

void MediaCaptureDevicesImpl::OnAudioCaptureDevicesChanged(
    const MediaStreamDevices& devices)
{
    if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
        UpdateAudioDevicesOnUIThread(devices);
    } else {
        BrowserThread::PostTask(
            BrowserThread::UI, FROM_HERE,
            base::Bind(&MediaCaptureDevicesImpl::UpdateAudioDevicesOnUIThread,
                base::Unretained(this), devices));
    }
}

void MediaCaptureDevicesImpl::OnVideoCaptureDevicesChanged(
    const MediaStreamDevices& devices)
{
    if (BrowserThread::CurrentlyOn(BrowserThread::UI)) {
        UpdateVideoDevicesOnUIThread(devices);
    } else {
        BrowserThread::PostTask(
            BrowserThread::UI, FROM_HERE,
            base::Bind(&MediaCaptureDevicesImpl::UpdateVideoDevicesOnUIThread,
                base::Unretained(this), devices));
    }
}

MediaCaptureDevicesImpl::MediaCaptureDevicesImpl()
    : devices_enumerated_(false)
{
}

MediaCaptureDevicesImpl::~MediaCaptureDevicesImpl()
{
}

void MediaCaptureDevicesImpl::UpdateAudioDevicesOnUIThread(
    const MediaStreamDevices& devices)
{
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    devices_enumerated_ = true;
    audio_devices_ = devices;
}

void MediaCaptureDevicesImpl::UpdateVideoDevicesOnUIThread(
    const MediaStreamDevices& devices)
{
    DCHECK_CURRENTLY_ON(BrowserThread::UI);
    devices_enumerated_ = true;
    video_devices_ = devices;
}

} // namespace content
